WO2004008690A1 - Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette) - Google Patents

Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette) Download PDF

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Publication number
WO2004008690A1
WO2004008690A1 PCT/EP2002/007860 EP0207860W WO2004008690A1 WO 2004008690 A1 WO2004008690 A1 WO 2004008690A1 EP 0207860 W EP0207860 W EP 0207860W WO 2004008690 A1 WO2004008690 A1 WO 2004008690A1
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WO
WIPO (PCT)
Prior art keywords
address
agent
home agent
foreign
packet
Prior art date
Application number
PCT/EP2002/007860
Other languages
English (en)
Inventor
Jochen Eisl
Mathias Rautenberg
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to US10/521,583 priority Critical patent/US20060010250A1/en
Priority to PCT/EP2002/007860 priority patent/WO2004008690A1/fr
Priority to EP02807593A priority patent/EP1522171B1/fr
Priority to ES02807593T priority patent/ES2268165T3/es
Priority to CA002492545A priority patent/CA2492545A1/fr
Priority to AT02807593T priority patent/ATE339048T1/de
Priority to MXPA04012710A priority patent/MXPA04012710A/es
Priority to BRPI0215749A priority patent/BRPI0215749B1/pt
Priority to DE60214605T priority patent/DE60214605T2/de
Priority to AU2002368064A priority patent/AU2002368064A1/en
Priority to CN02829333.9A priority patent/CN1640058A/zh
Publication of WO2004008690A1 publication Critical patent/WO2004008690A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5084—Providing for device mobility

Definitions

  • the invention concerns a method and an optimized home agent for transfer of IP datagrams over a path from a sender over a radio access network to a mobile host .
  • the Mobile IP protocol is a concept to deal with user mobility issues for transport of IP related services.
  • the access network as well as the core network use IP as the network layer protocol and are capable to run the mobile IP protocol in addition.
  • the network architecture for mobile IPv4 includes home agents and foreign agents to build forwarding IP tunnels, when a mobile host moves out of the home network to attach to a different access point for requesting services from a network.
  • the foreign agent represents the default router for a mobile host, if it is attached to an access point outside the home network.
  • the home agent intercepts all packets for that host and reroutes them to the new location.
  • the home agent's binding cache contains rerouting information for all mobile hosts currently attached to different access points.
  • the care-of-address specifies the mobile node's temporarily acquired host address after registering at a different location.
  • the MPLS called label switching approach offers support for IP traffic engineering by introduction of virtual circuit switched services in connectionless IP based networks.
  • Other benefits of MPLS include the establishment of virtual private networks and provision of traffic trunks with dedicated reserved bandwidth between two endpoints of a path (tunnel) .
  • label switching When label switching is active, packet forwarding is based on a fixed label instead of an IP network address or prefix in the routing table.
  • a label is attached by a label ingress router, which is the ingress router of the MPLS path.
  • the label egress router represents the endpoint of a MPLS tunnel.
  • Path setup requires a signaling protocol to agree on path attributes like labels to be used and requested bandwidth for the path etc. Examples are CR-LDP, RSVP-TE or BGP enhancements.
  • a network operator has to deal with convergence issues, if there is a strategy to offer mobile IP based services in a network, which has been engineered for MPLS.
  • Functional components for mobile IP and MPLS may reside on the same network node in the situation described above.
  • one network node may include home agent and label edge router functionality at the same time.
  • existing MPLS tunnels may be used for rerouting purposes in mobile IP instead of establishing a separate IP tunnel in parallel. This would allow the network operator to easily adapt mobility services to a MPLS infrastructure without the need for complex network resource management.
  • a different approach is a loose coupling between MPLS and mobile IP.
  • Home agent and label edge router would reside on the same network node without direct interaction between these components. The same applies to the foreign agent, which includes the label edge router functional components as well.
  • Packets, which are destined for a mobile host, which is attached to a foreign access point would have to be transported by means of an IP tunnel and a MPLS tunnel as well for the loose coupling.
  • Home agent in this example first would have to encapsulate the native IP packet with an additional IP header, afterwards a label is attached to this packet by the label switching ingress router.
  • a pure MPLS network might be sufficient to forward packets to the foreign agent for the loose coupling approach. Nevertheless advantage of label switched paths is not used completely, since an additional IP tunnel is required.
  • An object of the invention is an efficient transport of mobile IP traffic. This is achieved by the invention as set forth in the independent claims .
  • Static means that label switched paths have been configured in advance based on mechanisms like traffic engineering. Primarily the focus is on a single administrative domain, where a network operator controls all network nodes, which are involved in mobility issues. Though the mechanism is not restricted to a single network domain. With the introduced concept full advantage of an existing MPLS network can be gained for mobile IP forwarding. It is assumed that by means of traffic engineering a mesh of label switched paths has been established, which can be used for redirecting packets between any pair of mobile home agents and foreign agents in the current administrative domain. For the purpose of mobile IP no additional label switched paths have to be created or modified. As well no IP tunnels are required between a home agent and a foreign agent .
  • the solution for convergence proposes an optimisation of mobile home / foreign agents by efficiently incorporating label edge router functionality.
  • a tight coupling between MPLS and mobile IP is achieved. No changes for existing protocols like mobile IP or label distribution protocol are required. Efficient usage of preestablished label switched paths for the transport of redirected packets between mobility agents requires traffic engineering for mobility. In that context it is necessary to gain knowledge about behaviour of mobile users, i.e frequency of leaving home networks, services to be requested at foreign access points etc.
  • the mechanism described for convergence between MPLS and mobile IP may be extended to different administrative domains. Macro mobility describes the situation, where a mobile user might attach to an access point, which is controlled by a different administrative authority in a geographically distinct area. Mobile IP forwarding and MPLS paths between separate domains may be enabled if service level agreements are established between adjacent network domains.
  • a modified home agent which includes label edge router capability. Packet forwarding to any mobile host in a visited network is done exclusively by means of label switched paths, which interconnect mobility home and foreign agents. Thus for new mobility bindings in the home agent no creation or modification of label switched paths is required.
  • a list of potential visited subnetworks in the operators network domain is maintained by each home agent in the network domain and configured by means of network " administration principles. The list is required to enable mapping of the mobile nodes care of addresses to a visited subnetwork.
  • An aggregated FTN table (Forwarding equivalence class To Next hop label forwarding entry) : Generally for MPLS label switching the ingress router maintains this table for determining the necessary label and interface to use for a specific destination address. The home agent maintains this table with a single entry for each potential visited subnetwork, instead of an individual entry for each mobility binding. Thus all mobile hosts attached to the same visited subnetwork correspond to one and the same entry in FTN table, which introduces scalability for the combined MPLS / mobility approach.
  • Figure 1 shows a block diagram of an IP network.
  • Three mobile stations MS 1, 2, 3 use some wireless link layer technology to connect to an IP based radio access network 4.
  • Correspondent base stations BS 5, 6 , 7 terminate the radio interface.
  • the radio access network provides mobility support and uses label switched paths LSP 37, 62 for internal transport as already described for this invention.
  • Connectivity to transport networks 14 is achieved via border routers BR 8, 9, which separate the administrative domains.
  • all three mobile stations 1, 2, 3 are located in the same home network 4 - they get access by the same edge router, which includes the home agent (15) functional component at the same time.
  • MS 2 and MS 3 currently moved to different access points (BS 6,7) and attach to the network through foreign agents FA 11 and FA 12 respectively.
  • LSP's 37, 62 are illustrated for label switching between home agent HA 15 and foreign agents FA 11, 12.
  • a correspondent node CN 13 typically located at any access point beyond the local network 4 should send data to all three mobile stationsl, 2, 3.
  • For packets destined for MS 1 no entry in the binding cache (in 15) is available, thus packets are directly forwarded to MS 1.
  • Now CN 13 sends data to MS 2.
  • Home agent HA 15 includes a binding for MS 2 with care-of-address 137.21.16.5. From a configured subsystem list, the home agent is aware that MS 2 is currently reachable through subnetwork 137.21.16.0.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un agent local et un procédé de transfert d'un paquet IP sur une voie depuis un expéditeur (noeud correspondant) sur un réseau d'accès radio (RAN, HA, FA 11) vers un hôte mobile (MS 2), un agent local (HA) reçoit un paquet de données entrant déterminé pour un hôte mobile (MS 2) avec une adresse de destination (adresse MS 2 : 137.21.16.5), l'agent local (HA) détermine s'il existe une correspondance entre l'adresse de destination (adresse de MS 2: 137.21.16.5) du paquet et une adresse de sous-réseau (adresse FA 11: 137.21.16.0) d'un agent étranger (FA 11) stocké dans une liste d'adresses de sous-réseau (137.21.16.0; 137.22.25.0) stockées dans une liste au niveau de l'agent local (HA), s'il existe une correspondance entre l'adresse de destination (adresse MS 2: 137.21.16.5) et une adresse de sous-réseau (adresse FA 11: 137.21.16.0) d'un agent étranger, l'agent local détermine s'il existe un chemin préconfiguré allant de l'agent local (HA) audit agent étranger et l'agent local (HA) envoie le paquet audit agent étranger (FA 11) sur ledit chemin commuté par étiquette préconfiguré (37) s'il existe un chemin commuté par étiquettes (37) vers ledit agent étranger.
PCT/EP2002/007860 2002-07-15 2002-07-15 Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette) WO2004008690A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US10/521,583 US20060010250A1 (en) 2002-07-15 2002-07-15 Home agent optimization for handling mobile ip and static mpls (multiprotocol label switching)
PCT/EP2002/007860 WO2004008690A1 (fr) 2002-07-15 2002-07-15 Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette)
EP02807593A EP1522171B1 (fr) 2002-07-15 2002-07-15 Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette)
ES02807593T ES2268165T3 (es) 2002-07-15 2002-07-15 Optimacion de agente local para manipular ip movil y mpls estaticas (conmutacion de etiquetas multiprotocolo).
CA002492545A CA2492545A1 (fr) 2002-07-15 2002-07-15 Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette)
AT02807593T ATE339048T1 (de) 2002-07-15 2002-07-15 Heimat-agent-optimierung für die behandlung von mobil-ip und statischer mpls (mehrprotokoll-label-switching)
MXPA04012710A MXPA04012710A (es) 2002-07-15 2002-07-15 Optimizacion de agente local para manejar ip moviles y trayectorias conmutadas de etiqueta estatica.
BRPI0215749A BRPI0215749B1 (pt) 2002-07-15 2002-07-15 otimização de agente residente para manipulação de ip móvel mpls estática (comutação de etiqueta de multiprotocolo).
DE60214605T DE60214605T2 (de) 2002-07-15 2002-07-15 Heimat-agent-optimierung für die behandlung von mobil-ip und statischer mpls (mehrprotokoll-label-switching)
AU2002368064A AU2002368064A1 (en) 2002-07-15 2002-07-15 Home agent optimization for handling mobile ip and static mpls (multiprotocol label swithching)
CN02829333.9A CN1640058A (zh) 2002-07-15 2002-07-15 处理移动ip和静态mpls(多协议标记转换)的归属代理优化

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/007860 WO2004008690A1 (fr) 2002-07-15 2002-07-15 Optimisation d'agent local pour la gestion d'ip mobile et de mpls statique (commutation multiprotocole par etiquette)

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WO2004008690A1 true WO2004008690A1 (fr) 2004-01-22

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Country Status (11)

Country Link
US (1) US20060010250A1 (fr)
EP (1) EP1522171B1 (fr)
CN (1) CN1640058A (fr)
AT (1) ATE339048T1 (fr)
AU (1) AU2002368064A1 (fr)
BR (1) BRPI0215749B1 (fr)
CA (1) CA2492545A1 (fr)
DE (1) DE60214605T2 (fr)
ES (1) ES2268165T3 (fr)
MX (1) MXPA04012710A (fr)
WO (1) WO2004008690A1 (fr)

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Publication number Publication date
US20060010250A1 (en) 2006-01-12
ES2268165T3 (es) 2007-03-16
BR0215749A (pt) 2005-03-15
CN1640058A (zh) 2005-07-13
DE60214605D1 (de) 2006-10-19
CA2492545A1 (fr) 2004-01-22
EP1522171B1 (fr) 2006-09-06
DE60214605T2 (de) 2007-08-23
EP1522171A1 (fr) 2005-04-13
BRPI0215749B1 (pt) 2015-12-29
MXPA04012710A (es) 2005-08-15
AU2002368064A1 (en) 2004-02-02
ATE339048T1 (de) 2006-09-15

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